▎ 摘　　要

NOVELTY - Self-supporting fluorine-nitrogen doped graphene film material comprises 2-9.5% nitrogen, and 1-2% fluorine. USE - The graphene film material is useful as anode in sodium-ion batteries by cutting into fixed-size disk (claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing self-supporting fluorine-nitrogen doped graphene film comprising (1) uniformly dispersing deionized water with graphene oxide on substrate to form a liquid film, drying under air atmosphere at 50-80 degrees C to obtain a graphene oxide film, and (ii) immersing the graphene oxide film in a mixture of acetonitrile and hydrofluoric acid, heating at more than 90 degrees C and less than 180 degrees C for 24-48 hours to achieve doping of the graphene oxide film by fluorine and nitrogen, where in mixture of acetonitrile and hydrofluoric acid the hydrofluoric acid is an aqueous solution of 40-50% hydrofluoric acid and the volume ratio of acetonitrile and hydrofluoric acid is 20-30:1-5)